Rock drill



E. G. GARTIN Oct. 30, 1928.

ROCK DRILL Filed Aug. 7, 1926 Patented Oct. 30, 1928.

UNITED STATES PATENT OFFICE.

ELMER G. GARTIN, OF CLAREMONT, NEW HAMPSHIRE, ASSTGNOR TO SULLIVAN MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS.

ROCK

DRILL.

This invention relates to rock drills of the hammer type and more particularly to retaining means for the drill steels of such drills.

An object of this invention is to provide an improved retainer for rock drill steels. Another object of this invention is to provide an improved resilient drill steel retainer which may be adjusted expeditiously with a minimum of effort on the part of the operator. A still further object of this invention is to provide an improved drill steel retainer having an improved and simplified resilient mounting therefor wherein the shocks upon the retainer encountered during the drilling operation are readily absorbed and wherein breakage of the retainer parts are reduced to a minimum. Other objects will appear.

In the accompanying drawings I have shown for purposes of illustration one embodiment which my invention may assume in practice.

In these drawings,--, v

Fig. 1 is a plan view, partially in section, of the forward end of a rock drill incorporating my improved drill steel retainer, the retainer yoke being shown in a plurality of positions.

Fig. 2 is a side elevational view partially in 7 section of the rock drill shown in Fig. 1..

Fig. 3 is a transverse vertical sectional view taken on line 3-3 of Fig. 1.

Fig. 4 is a detail view illustrating a portion of the improved retainer mounting and look.

In this illustrative embodiment of my invention I have shown a rock drill which may be of any standard form and which herein comprises a cylinder'l and a chuck housing 2 which herein carries a usual collared drill steel 3, the cylinder 1 and the housing 2 and the other drill parts being resiliently maintained in assembled'relation by means of usual side rods 4 and cooperating tension springs 5. As the specific construction of the rock drill does not enter into this invention, further de tailed description and illustration of the same is deemed unnecessary other than to state that a reciprocatory hammer piston (not shown) is mounted within the cylinder 1 and is adapted to impart a series of hammer blows to the shank end of the drill steel 3 to actuate the latter in a well known manner. The chuck housing 2 has preferably formed integral therewith laterally projecting'lugs' 6, these lugs being disposed at right an les with respect to the side rods 4 as clearly s own in Fig. 8. As illustrated, these lugs .6 are recessed, as at 7, and are provided with smooth arcuate bearing surfaces 8 and rotatably mounted in these recesses are inwardly projecting cylindrical supporting members 9 formed on the retainer yoke 10. The retainer yoke 10 embraces the drill steel 3 at its forward end and is provided with a collared portion 11 with which the usual collar on the drill steel is adapted to engage, the collared portion 11 forming an abutment or stop for preventing the steel 3 being driven forwardly from the chuck by the hammer piston. The retainer 10 is resiliently maintained within the recesses 7 by means of an annular member '12 surrounding the forward cylindrical portion of the chuck housing Q'and movable axially relative to the latter. This annular member has formed on the rear surface thereof arcuate notches or recesses 13 which receive the cylin- I viously mentioned, the retainer yoke is rotatav bly mounted on the chuck housing and may be swung laterally to its released position as indicated by broken lines in Fig. 1 to permit free withdrawal of the drill steel 3 from the chuck. To maintain the retainer in its operative position as shown by full lines in Fig. 1, projections 17 having inclined ends are formed on the inner face of each of the cylindrical portions 9 of the retainer yoke and these projections cooperate with longitudinally extending slots or recesses 18 formed in the side of the chuck housing at the bottoms of the .recesses 7 these projections and slots forming a positive lock for the retainer yoke.

h In the use of my improved drill steel retainer, it will herein be noted that when it is desired to remove the drill steel from the chuck housing, the operator grasps the re- 5 the yoke is then swung inwardly until the projections lZagain snap within the notches 18, consequently locking the retainer yoke in its operative retaining position. It will also be noted'that as the collar of the drill steel 3 hammers against the collared portion 11 of the retainer yoke, the coiled spring 16 yields, consequently absorbing the shocks and thereby reducing breakage of the retainer yoke and its related parts to a minimum. It will further be evident that if for any reason it is desired to dismantle the retainer, the operatormerely releases the clamping bolt 15 and slides the clamp 14, spring 16, annular member 12, and retainer yoke longitudinally from 20 the chuck housing, the retainer being dismantled with facility and expeditiously.

As a result of this invention it will be noted that the improved retainer is of exceedingly simple and rugged character especially adapted to use under the severe service conditions encountered in rock drilling and which may be applied to a standard rock drill with a minimum of change and expense. These and other objects and advantages of 80 the invention will be clearly apparent to those skilled in this art.

While I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form of the same is shown for I mg surfaces'comprisin '65 purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by- Letters Patent is:

1. In a rock drill, a chuck housing having laterally projecting lugs presenting arcuate bearing surfaces, a retamer yoke pivotally mounted on said chuck housing and having cylindrical portions cooperating with said arcuate bearlng surfaces, and means for resiliently maintaining said cylindrical portions in engagement with the bearing surfaces on said lugs comprising an annular member surroundmg said chuck housing and engaging said cylindrical portions, a member clamped to said chuck housing and a spring interposed between said annular member and said clamp.

2. In a rock drill, a chuck housing having laterally projecting lugs having arcuate bearing surfaces thereon, a retainer yoke pivotally mounted on said chuck housing and having cylindrical portions cooperating with said bearing surfaces, and yieldable means for maintaining said cylindrical portions in engagement with said arcuate bearan abutment member secured to said chuc housing, a member engaging said cylindrical portions, and a spring interposed between said abutment member and saidlast mentioned member.

3. In a rock drill, a chuck housing having laterally projecting lugs presenting arcuate bearing surfaces, a retainer yoke pivotally mounted on said chuck housing and having cylindrical portions engaging said arcuate bearing surfaces, and yieldable' means for maintaining said cylindricalportions against said arcuate bearing surfaces comprising an annular member surrounding said chuck housing and having arcuate recesses receiving said bearing portions, an annular member secured to saidchuck housing, and a coiled spring encircling said chuck housing and interposed between said annular members.

4. In a rock drill, a chuck housing having laterally projecting lugs presenting arcuate bearing surfaces, a retainer yoke pivotally mounted on said chuck housing and havlng cylindrical portions engaging said arcuate bearing surfaces, and means for yleldably maintaining said cylindrical portions against said arcuate bearing surfaces comprising an annular member surrounding said chuck housing having arcuate recesses receiving sald cylindrical portions, said annular member being movable axially relative to said chuck housing, an annular member secured to sald chuck housing, and a coiled spring encircling said chuck housing and interposed between I said annular members.

5. In a rock drill, a chuck housing having laterally projecting lugs presenting arcuate bearing surfaces, a retainer yoke pivotally mounted on said chuck housing and having cylindrical bearing portions engaging said bearing surfaces, and means for yleldably maintaining said cylindrical portions agalnst said bearing surfaces comprising an annular member surrounding said chuck houslng and having arcuate recesses receiving sald cylindrical portions, said annular member being movable axially relative to said chuck housing, an annular member clamped to the forward end'of said chuck housing and a coiled spring encircling said chuck housing and interposed between said annular members.

6. In a rock drill, a chuck housing having laterally projecting lugs presenting arcuate bearing surfaces, a retainer yoke plvotally mounted on said chuck housing and hav ng cylindrical portions engaging sald bear ng surfaces, and means for yieldably maintalning said cylindrical portions against said bearing surfaces comprising an annular member surrounding said chuck housing and having arcuate recesses receiving saidcylindrlcal portions, 'a split member surrounding the forward end of said chuck housing and rigldly clamped thereto, and a coiled spring encircling said-chuck housing and interposed between said split member and said annular member.

laterally'projecting lugs presenting arcuate bearing surfaces, a retainer yoke pivotally mounted on said chuck housing and having cylindrical portions engaging said bearing surfaces, yieldable means for. maintaining said cylindrical portions against said bearing surfaces, and means for locking said retainer yoke in position comprising projections formed on the inner sides of said cylindrical portions and cooperating with recesses formed in said chuck housing.

9. In a rock drill, a chuck housing having laterally projecting lugs presenting arcuate bearing surfaces, a retainer yoke pivotally mounted on said chuck housing and having cylindrical portions engaging said bearing surfaces, yieldable means for maintaining said bearing portions against said bearingysurfaces comprising an annular member surrounding said chuck housing and engaging said cylindrlcal portions, an annular member secured to said chuck housing, a coiled spring encircling said chuck housing and interposed between said annular members, and means for locking said retainer in position comprising cooperatin projections and recesses formed on the cylindrical portions of said retainer yoke and chuck housing. g

10. In a rock drill, a chuck housing having laterally projecting lugs presenting arcuate bearing surfaces, a retainer yoke pivotally mounted, on said chuck housing and-having cylindrical portions engaging said bearing surfaces, yieldable means for maintaining said bearing portions against said bearing surfaces comprising an annular member surrounding said chuck housing and engaging said cylindrical portions, an annular member secured to said chuck housing, and a coiled spring encircling said chuck housing and interposed between said annular members, and means for locking said retainer yoke in position comprisln' projections formed on the cylindrical portlons of-said retainer yoke cooperating with recesses formed in said chuck housing adjacent said cylindrical portions.

11. In a rock drill, a chuck housing having laterally projecting'lugs presenting arcuate bearing surfaces, a retainer yoke pivotally mounted onsaid chuck housing having inwardly projecting cylindrical portions en'- gagmg said bearing surfaces, and yieldable Y means for maintaining said cylindrical portainer yoke tions against said bearing surfaces comprising an annular member surrounding said chuck housing and engaging said cylindrical portions, an annular member secured to said chuck housing at the forward end thereof,

"and a coiled spring encircling said chuck housing and interposed between said annular members. M

12. In a rock drill, a chuck housing having laterally projecting lugs presenting arcuate bearing surfaces, a retainer yoke pivotally mounted on said chuck housing having inwardly projecting cylindrical portions engaging said bearing portions, yieldable means for maintaining said 0 lindrical portions against said bearing surfaces comprising an annular member surrounding said chuck housing and having arcuatev recesses receiving said cylindrical portions, said annular member being movable axially relative to said chuck housing, a member surrounding said chuck housing and clamped thereto and a coiled spring encircling said chuck ousing and interposed between said annular meming laterally projecting lugs having recesses therein and arcuate bearing surfaces, a re-" tainer yoke pivotally mounted on said chuck housing and having cylindrical supporting members at its inner end disposed in said recesses and engaging said bearing surfaces, yieldable means for maintaining said supporting members against said bearing surfaces comprising an annular member sur rounding said housing and having arcuate recesses receiving said supporting members,

said annular member being movable axially,

relative to-said housin a member clamped to the forward end 0 said housing, and a coiled spring encircling said housing and interposed between said annular member and said clamping member, and means'for locking said retainer yoke in position comprisin proj ections formed on-the inner sides of sai supporting members and cooperating with elongated recesses formed on the sides of said housing at the bottoms of said recesses:

14. In a rock drill, a chuck housing, a drill steel retainer yoke pivotally mounted thereon and having cylindrical supporting members, and means formed on said cylindrical supporting membersand cooperating directly with said housing for locking said retainer yoke in operative position 15. In a rock drill, a chuck housing,-a drill steelcarried by said housing, a drill steel reivotally mounted thereon and having cylin ical supporting members, and

means for locking said retainer yoke in operative position comprising projections formed on said cylindrical supporting members and cooperating with recesses on said housing.

16. In a rock drill, a chuck housing, a drill steel carried by said housing, a drill steel retainer yoke pivotally mounted thereon and having cylindrical supporting members at its inner end, and means for locking said retainer yoke in operative position comprising projections formed on the inner sides of said supporting members cooperating with recesses on the sides of said housing.

17.. In a rock drill, a chuck housing having laterally projecting therefrom elements presenting arcuate bearing surfaces, a retainer yoke pivotally mounted on said chuck housing and. having portions providing arouate surfaces cooperating with said arcuate bearing surfaces, and means for resiliently maintaining said arcuate surfaces in engagement including an abutment surroundin and clamped to saidchuck housing, and resilient means maintained under tension thereby.

18. In a rock drill, a chuck housing having laterally projecting lugs, a drill steel retainer yoke pivotally mounted on said chuck housing, said lugs and yoke having cooperating pivotal vbearing surfaces, yielding means acting on said yoke to maintain said bearing surfaces in contact comprisin a coiled spring encircling said chuck hou ng, and an annular member secured to said chuck housing to form an abutment for said spring. 

